The Jfet on the working side is reading constant 4.3vdc while the non-working is 5.0vdc. Is that significant?
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sts9fan said:
Well, first I would make sure it is an input issue 😉
So far, there are about 99% chance that it isn't.
Magura 🙂
sts9fan said:
You need to take a photo of the upside and the downside of the project.
This way we have a chance to see if you have done something wrong. Next you can take a schematic, and post the measured voltages.
If you want to go try fix this yourself, compare the measurements of the good and the bad channel, and see where something is significantly different.
I personally would not take much notice of 0.7V difference, between a working channel, and a bad channel.
Magura 🙂
ok I will post a picture. Don't be too tough though because I soldered this over a year ago and had no idea that lead-free solder was so hard to work with. Live and learn.
ok lets see if I can get it to a normal size.
here is a link
http://travel.webshots.com/photo/2158154950086056042OdSjgl
http://travel.webshots.com/photo/2673423630086056042vokfVs
here is a link
http://travel.webshots.com/photo/2158154950086056042OdSjgl
http://travel.webshots.com/photo/2673423630086056042vokfVs
I think I'd start out by cleaning those boards. Alcohol should do. Then you can see if something is touching.
Magura 🙂
Magura 🙂
Here we go looks a bit better. I am having a hard time taking a picture. I am going to try and fix some of the solder joints carefully. Thanks for your help. Next I am going to take measurements and put them on the schematic.
An externally hosted image should be here but it was not working when we last tested it.
Thanks Mike. I hope to be able to get it working soon. I am going to put some hours in tommorow.
Next step would be to re-solder all the joints, with 40/60 solder. Then clean it up again, and see if it didn't begin to behave.
Magura 🙂
Magura 🙂
FIXED!!!!! Shockingly there was a blob of solder where it did not belong. Thanks for your help!
Kris
Kris
I have a nice board of cocobolo that I am going to use make a faceplate. I figured after putting my lack of metal working skills to the test I would test my lack of woodworking skills.🙂
sts9fan said:
Actually this is not shocking at all 😉
I have been helping many "first projects" over the years.
When such are not working, 99% of the cases, it is due to one of these reasons:
1) Component misplaced, or turned 180 degrees.
2) A solder "blob" .
3) A solder whisker hiding in the flux residue.
4) A bad solder joint.
5) Wrong polarity of external connections
So, it's a rare newbe problem, that is not fixed by the above checklist.
Magura 🙂
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